"Hannah sat upright on top of her eighteen-year-old brother and swept her sweaty hair away from her face. Cum leaked from her sixteen-year-old pussy down over his exhausted dick and emptied balls." --- His sister falls in love with her brother and wants to be close... Really close!
Barbara is in her mid-30s but she has an insatisable sexual appetite for younger men, mainly in the teens or early 20s. She never fails to find a willing horny younger man who's hot to fuck a sexy woman with a wet hot pussy. This night with Robbie is no different.
Mark catches his sister red-handed (well, sort of), which leads to her giving him some quite unusual sisterly advice. (Written a while back under a different pen name, but still pretty good IMHO.)